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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daa0d49366128bd3d8340407bd5944ab1c2eda11cd171902c058b59bb0422c42' 
  AND token = 'nC+vIQfL6DATTf3cq+gUjsPGN6UTE+g4YJU+SMo3Qi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}